Calificación
Reparto

Jon Pertwee
The Doctor

Katy Manning
Jo Grant

Roger Delgado
The Master

Nicholas Courtney
Brigadier Lethbridge-Stewart

Richard Franklin
Captain Mike Yates

John Levene
Sergeant Benton

Ingrid Pitt
Galleia

Wanda Moore
Dr. Ruth Ingram

Ian Collier
Stuart Hyde

John Wyse
Dr. Percival

Neville Barber
Dr. Cook

Donald Eccles
Krasis

Aidan Murphy
Hippias

Keith Dalton
Neophite

Barry Ashton
Proctor

Marc Boyle
Kronos